That's an interesting point, and I definitely agree that lower insulin doses reduces the risk of catastrophic hypos. Not sure about the 130g though. When I had a lantus low, based on 17 units of lantus, an equivalent dose of humalog would have required 50g of carbs. I probably had about 40g of glucose, and my liver helped out and/or not all the lantus acted in one hit (I suspect at least a bit of the latter because I think there was some lantus in my system the next day) and though I went down to the low 2s I retained consciousness. But without that 40g of glucose I think I would have been lower, so am not sure whether my liver would have supplied its 130g in time....
I guess we should now go out and look up a fatal dose of insulin for a non diabetic??? (Anyone remember the story about the GP who was found guilty of murdering his wife by insulin because he googled the dosage?).
OK, my googling was pretty inconclusive (but a lot, ie 100s of units) but I don't think anyone really knows, as it's not an experiment you do on purpose....